/*
 * Copyright 2019 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.kie.workbench.common.dmn.webapp.kogito.common.client.services;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class FEELListParser {

    public static List<String> parse(final String input) {
        final List<String> items = new ArrayList<>();
        if (Objects.isNull(input)) {
            return items;
        }

        int start = 0;
        boolean inQuotes = false;
        for (int current = 0; current < input.length(); current++) {
            if (input.charAt(current) == '\"') {
                inQuotes = !inQuotes;
            }
            final boolean atLastChar = (current == input.length() - 1);
            if (atLastChar) {
                items.add(input.substring(start).trim());
            } else if (input.charAt(current) == ',' && !inQuotes) {
                items.add(input.substring(start, current).trim());
                start = current + 1;
            }
        }

        return items;
    }
}
